Dr. Ahmad Redaa
2024-09-18
Mechanism:
- Crystallization occurs as magma cools.
- As temperature decreases, minerals crystallize in a specific order
based on their melting points (Bowen’s Reaction Series).
Examples:
- Olivine (high-temperature crystallization)
- Quartz (low-temperature crystallization)
Bowen’s reaction series, Source: https://geologyhub.com
Mechanism:
- Minerals precipitate from hydrothermal fluids or gases that escape
from cooling magma.
- The fluids interact with rocks and cool, allowing mineral crystals to
form.
Examples:
- Gold and sulfide minerals (from
hydrothermal fluids)
- Chalcedony (from silica-rich fluids)
Source: https://slideplayer.com
Mechanism:
- Heat and pressure during metamorphism cause minerals in existing rocks
to recrystallize or form new minerals.
Examples:
- Garnet (high pressure and temperature)
- Kyanite (forms during regional metamorphism)
Garnet-staurolite-muscovite schist, Source: https://sites.pitt.edu
Mechanism:
- As water evaporates, minerals dissolved in the solution
crystallize.
Examples:
- Halite (from evaporating saltwater)
- Gypsum (from evaporating water)